Long-term Durability Evaluation of Concrete and Construction of Exposure Environment

本研究的目的是通过全国范围内的试验和当地的气候监测来评估混凝土的耐久性。试验从2003年开始，至今仍在继续。从这些调查中，澄清了以下结论：第一年(1)筑波的夏季和冬季气候条件都比栗滨严重得多。即冬季筑波比栗滨冷，夏季筑波比栗滨热。(2)因此，筑波暴露的混凝土抗压强度受到的影响明显大于栗滨。第5年(1)从17个地点的气候条件结果，可以对混凝土耐久性的进水条件进行几种分类。(2)混凝土生产初期的养护条件对混凝土的长期耐久性至关重要。

The purpose of this study is to evaluate the durability of concrete through the nation-wide testing and local climate monitoring. The test has been started since 2003, and still continuing.From these investigations, following conclusion was clarified.A. For the first year(1) The climate condition at Tsukuba was much severe than that at Kurihama in both summer and winter. In other word, Tsukuba was colder than Kurihama in winter season, and Tsukuba was hotter than Kurihama in summer season.(2) Therefore, the compressive strength of concrete exposed in Tsukuba were remarkably influenced more than that in Kurihama.B. For the fifth year(1) From the results of climate condition at 17 places, several classifications could be done as the influent condition for the durability of concrete.(2) The curing condition at early stage of concrete production is quite important for the long term durability of concrete.